JPH1020353A - Automatic focusing photography device and automatic focusing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic focusing photographing device capable of focusing-driving a photographic optical system even in operation of photographing (exposing). SOLUTION: In a photographing standby state, the focusing-driving part of the photographic optical system is controlled to be driven by a focusing driving control part so as to be in a focused state based on focusing detection information (S190). In the case the photographing optical system is moved in an optical axis direction in operation of photographing(exposing), information on the drive control of the focusingdriving part based on oscillation detection information is set(reset) by the focusing driving control part by taking the focusing detection information as a reference (S200). The focusing-driving part of the photographic optical system is controlled to be driven by the focusingdriving control part based on the oscillation detection information, then, the image forming state of the photographic optical system is adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic focusing photographing apparatus such as a camera capable of automatically adjusting the imaging state of a photographing optical system and an automatic focusing apparatus.

[0002]

2. Description of the Related Art In a conventional single-lens reflex camera equipped with an automatic focusing photographing device, a light beam transmitted through a photographing optical system is transmitted to a finder optical system and a TTL focus detection by a mirror provided at the rear of the photographing optical system. And the department. The drive amount required for focusing is calculated by calculation based on the focus detection information of the TTL focus detection unit, and the focusing drive unit moves the focusing lens in the photographing optical system based on the drive amount and focuses. The image state is being adjusted.

A camera having an autofocus function disclosed in Japanese Patent Application Laid-Open No. 3-256015 predicts the amount of movement of a subject based on the results of several past focus detections or a predetermined movement trajectory function. The imaging optical system is moved based on this to adjust the imaging state. JP-A-7-
The image stabilization camera disclosed in Japanese Patent No. 225405 calculates a driving amount based on a three-axis direction displacement calculated from a three-axis direction acceleration of the camera, and moves a photographing optical system based on the driving amount. The camera shake correction and the adjustment of the image formation state are performed. U.S. Pat. No. 3,455,221 relates to adjusting an imaging state by a power focus mechanism.

[0004]

In a single-lens reflex camera equipped with a conventional automatic focusing photographing apparatus, a TTL focus detection unit is provided with a photographing optical system during a photographing operation in order to perform a mirror-up operation during a photographing (exposure) operation. The imaging state of the system could not be detected. Therefore, in the conventional single-lens reflex camera, the focusing drive of the photographing optical system is stopped during the photographing operation. However, for example, during the close-up photographing operation, the camera may swing irregularly in the optical axis direction, and the focus state of the photographing optical system may change. The conventional automatic focusing photographing apparatus cannot detect such an irregular change in the focusing state during the photographing operation, and cannot perform appropriate focusing driving.

Japanese Patent Laid-Open Publication No. Hei 3-256015 discloses that the imaging state of a photographing optical system is adjusted based on the predicted movement amount of a subject. There is no other way than to perform based on the predicted movement amount. Japanese Patent Application Laid-Open No. Hei 7-225405 discloses that when the focus state changes based on the swing of the camera during the photographing operation, the state of the focusing state should be adjusted based on the state of the photographing optical system. It was unknown. US Patent 34
In the power focus mechanism disclosed in Japanese Patent No. 55221, the focus drive cannot be performed at such a speed as to respond to a change in the focus state based on the swing of the camera. In addition, it detects a change in the focus state based on the swing of the camera during the shooting operation,
Even when the photographing optical system is driven, see Japanese Patent Application Laid-Open No.
As in Japanese Patent Application Laid-Open No. 5 (1993) -1995, it was unclear what state of the photographing optical system should be used to start adjusting the focus state.

SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic focusing photographing apparatus and an automatic focusing apparatus which can perform focusing driving of a photographing optical system even during a photographing operation.

[0007]

The present invention solves the above-mentioned problems by the following means. In addition, in order to make it easy to understand, description is given with reference numerals corresponding to the embodiment of the present invention, but the present invention is not limited to this. That is, the first aspect of the present invention provides a photographing optical system (101, 10
2, 103), an in-focus state of the imaging optical system, and a focus detection unit (6) for outputting in-focus detection information (S160); and a swing state of the imaging optical system. A swing detection unit (5) that outputs swing detection information (S140),
A focus drive unit (8) for adjusting the imaging state of the photographing optical system
After the drive control of the focusing drive unit based on the focus detection information (S190), the focusing is performed based on the swing detection information in the optical axis (I) direction of the photographing optical system. A focusing drive control section (4) for controlling the drive of the drive section (S240).

According to a second aspect of the present invention, in the automatic focusing photographing apparatus according to the first aspect of the present invention, the focusing driving control unit drives the focusing driving unit based on the focusing detection information in a photographing preparation state. In addition to the control, in the photographing operation state, the drive control of the focusing drive unit based on the swing detection information is performed.

[0009] The invention of claim 3 is claim 1 or claim 2.
In the automatic focusing photographing apparatus according to the invention, the focusing drive control unit sets information on drive control of the focusing drive unit based on the swing detection information based on the focus detection information (S240). It is characterized by the following.

[0010] The invention of claim 4 is claim 1 or claim 2.
In the automatic focusing photographing device according to the invention, the focusing drive control unit resets information on drive control of the focusing drive unit based on the swing detection information based on the focusing detection information (S240). It is characterized by:

[0011] The invention of claim 5 is the invention of claims 1 to 4.
In the automatic focusing photographing device according to any one of the above inventions, a light guide unit (71) for guiding a light beam from the photographing optical system to the focus detecting unit, and a photographing operation of the automatic focusing photographing device. A light guide moving mechanism (7) for moving the light guide is provided, and the focusing drive control unit is configured to move the light guide by the light guide moving mechanism (S250). The driving control of the focusing drive unit is performed based on the swing detection information.

[0012] The invention of claim 6 is the first to fifth aspects of the present invention.
In the automatic focusing photographing device according to any one of the above inventions, the focusing drive control unit determines whether it is necessary to perform drive control of the focusing drive unit based on the swing detection information. It is characterized by making a determination (S220).

[0013] The invention of claim 7 is the invention of claims 1 to 5.
The automatic focusing photographing apparatus according to any one of the above aspects, further comprising an optical system position detecting section (9) for detecting photographing distance and / or photographing magnification information (S170) from the state of the photographing optical system, The focus drive control unit determines whether it is necessary to perform drive control of the focus drive unit based on the shooting distance and / or the shooting magnification information (S230).
It is characterized by doing.

The invention of claim 8 is the first to seventh aspects of the present invention.
The blur correction unit (10) for correcting blur by driving a part of the photographing optical system in a direction substantially orthogonal to the optical axis. And a shake correction control unit (4) for controlling the drive of the shake correction unit.
A drive control of the shake correcting section is performed based on the swing detection information (S140, S260).

According to a ninth aspect of the present invention, there is provided an optical system, a focus detecting section for detecting an image forming state of the optical system and outputting focus detection information, and detecting a swing state of the optical system. A swing detection unit that outputs swing detection information, a focus drive unit that adjusts the imaging state of the optical system, and the focus drive unit based on focus detection information from the focus detection unit. After controlling the drive of
A focus drive control unit that drives and controls the focus drive unit based on the swing detection information in the optical axis direction of the optical system.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) Hereinafter, an embodiment of the present invention will be described in more detail with reference to the drawings and the like. First, a single-lens reflex camera using the shake correction apparatus according to the present embodiment will be described, and an outline of the shake correction apparatus will be described.
FIG. 1 is a schematic sectional view showing a single-lens reflex camera in which the automatic focusing photographing apparatus according to the first embodiment is used. FIG.
FIG. 2 is a block diagram of the automatic focusing photographing apparatus according to the first embodiment.

As shown in FIG. 1, the lens barrel 2 has a first
And a second lens group 102 that moves in the same direction as the optical axis (hereinafter referred to as the optical axis) I of the main optical system to adjust the focus so as to form an image of a subject on the image forming plane 1a. (Hereinafter, referred to as a focusing lens) and a third lens group 103 (hereinafter, referred to as a third lens group) (hereinafter, referred to as a third lens group) that corrects blur by driving in a direction perpendicular to the optical axis I (a Y-axis direction and a direction perpendicular to the plane of the drawing). This is a member for accommodating a photographing optical system consisting of a blur correction lens) and is mounted on the camera body 1. Note that, in FIG.
The point of intersection between the optical axis I and the optical axis I is the origin of the rectangular coordinates,
The axis and the imaging plane 1a are represented as XY planes.

The CPU 4 controls various operations of the camera body 1 and the lens barrel 2, and calculates various information from, for example, a shake detecting unit 5, a focus detecting unit 6, and a lens position detecting unit 9 which will be described later. This is a central processing unit that stores and stores, and detects an operation by a photographer based on a signal from a release switch 11 described later. In CPU4,
A blur detection unit 5, a focus detection unit 6, a mirror drive unit 7, a lens focusing drive unit 8, and a lens position detection unit 9, which will be described later.
, The blur correction drive unit 10 and the release switch 11 are connected. The CPU 4 detects the state of each detection unit and each switch, and controls the start and stop of driving of each drive unit. The CPU 4 has various functions such as a storage function, an arithmetic function, and a clock function.

The blur detecting section 5 is for detecting a blur caused by a hand shake or the like acting on the camera body 1 and the lens barrel 2. The blur detection unit 5 detects accelerations in three axial directions with respect to the camera body 1 and the lens barrel 2 in the left-right direction (X-axis direction), the up-down direction (Y-axis direction), and the optical axis I direction (Z-axis direction). An acceleration sensor 5a, a Y acceleration sensor 5b, a Z acceleration sensor 5c, a pitch angular velocity sensor 5d for detecting an angular velocity around the X axis,
Yaw angular velocity sensor 5e for detecting angular velocity around Y axis
And a roll angular velocity sensor 5f for detecting an angular velocity about the Z axis. Each of the above-described sensors outputs a signal corresponding to the detected shake. The signal is output to the CPU 4 after passing through an appropriate processing circuit such as an amplifier circuit including a filter and an amplifier (not shown).

The focus detecting section 6 is for detecting a focal position of the photographing optical system. The focus detection unit 6 is a TTL focus detection unit that measures the illuminance of the subject light that has passed through the imaging optical system, and is preferable because the focus detection device using the split pupil method can detect the defocus amount. The focus detection unit 6 outputs information on the detected focus position to the CPU 4.

The mirror driving unit 7 operates the mirror 7 during the photographing operation.
1 is to be retracted from the photographing light beam. The mirror driving unit 7 is disposed behind the photographing optical system, and drives a mirror (main mirror and sub-mirror) 71 that distributes a light beam transmitted through the photographing optical system to a finder optical system and a focus detection unit 6 (not shown). . Mirror drive unit 7
Drives the cam and the link by the DC motor and
, Or a mechanism that drives the mirror 71 up by a spring.

The lens focusing drive section 8 drives the focusing lens 102 in the photographing optical system in the direction of the optical axis I to adjust the focus of the photographing optical system in the direction of the optical axis I. The focus drive of the lens focus drive unit 8 is controlled by the CPU 4, and the cam barrel is rotated by a DC motor to move the focusing lens 102 in the Z-axis direction in the figure.

The lens position detector 7 is a focusing lens 102 driven by the lens focus driver 6.
In the optical axis I direction. The lens position detection unit 7 is a mechanism in which the focusing drive unit 6 rotates the cam barrel to move the focusing lens 102, and is, for example, an optical rotary encoder, an encoder including a gray code conduction pattern, a conductive brush, and the like. Read the rotation position of the cam cylinder. The lens position detection unit 7 outputs the detected signal to the CPU 4 and determines that the distance to the subject is C
It is calculated by PU4.

The blur correction drive unit 8 drives the blur correction lens 103 in a direction substantially orthogonal to the direction of the optical axis I in order to correct blur. The blur correction drive unit 8 is, for example, a mechanism that shift-drives a lens frame (stage) holding the blur correction lens 103 in the XY directions in the drawing by a voice coil motor (VCM). In addition, the shake correction drive unit 8 detects a drive position of the shake correction lens 103, such as a position sensor (position monitor unit) including a light emitting element (LED) and a light receiving element (PSD). A shift drive position detection mechanism is provided. The shake correction drive unit 8 is driven and controlled by a shake correction control signal output by the CPU 4 performing a predetermined process based on a signal from the shake detection unit 5. When a position sensor is used as the shift drive position detection mechanism, a detection signal from the position sensor is fed back to the CPU 4.

The release switch 11 is a switch composed of a half-press switch 11a and a full-press switch 11b described later. The half-press switch 11a is a switch for turning on the power of the camera or starting a series of shooting preparation operations, and is turned on when the release switch 11 is half-pressed. The ON signal of the half-press switch 11a is input to the CPU 4, and the CPU 4 starts the series of operations by detecting the ON signal. The full-press switch 11b is a switch for starting a photographing operation such as an exposure operation of the camera.
It is turned on when 1 is fully pressed. Full-press switch 1
The ON signal 1b is also input to the CPU 4, and the CPU 4 causes the camera to start an exposure operation by detecting the ON signal.

Next, the operation of the automatic focusing photographing apparatus according to the present invention will be described focusing on the operation of the CPU 4. FIG.
5 is a flowchart illustrating an operation of the automatic focusing photographing apparatus according to the first embodiment of the present invention. FIG. 4 is a flowchart following FIG. Step (hereinafter referred to as S)
At 100, the CPU 4 detects the ON operation of the power switch of the camera (not shown) or the ON operation of the half-press switch 11a due to the pressing of the release switch 11, and causes the camera to start a series of shooting preparation operations.
In the following description, each step is performed by the CPU 4 unless otherwise specified.

In S110, the CPU 4 determines that the CP
The timer provided inside U4 is started.

In step S120, the CPU 4 instructs the shake detection unit 5 to start the shake detection.
The vibration of the camera body 1 and the lens barrel 2 is detected according to an instruction from the CPU 4.

In S130, the CPU 4 determines whether or not the shake correction start timer is OK. CP
U4 compares the count value of the timer started in S110 with a predetermined storage value stored in a nonvolatile storage element such as an EEPROM in the CPU 4, for example. When it is determined that the count value of the timer exceeds the stored value, the process proceeds to S140. When it is determined that the count value does not exceed the stored value, each sensor of the shake detecting unit 5 may skip S140 and proceed to S150 because there is a possibility that an unstable output immediately after turning on the power, which adversely affects shake correction, may be performed. move on. After a predetermined time has elapsed since the power was turned on and the output of each sensor has stabilized, that is, after the count value has exceeded the stored value, the process proceeds to S140.

In S140, the CPU 4 causes the blur correction drive unit 10 to start blur correction driving. CPU4
Based on the shake detection information output from the shake detection unit 5,
A shake correction amount due to the shake of the camera body 1 and the lens barrel 2 is calculated. The CPU 4 controls the drive of the shake correction drive unit 10 based on the calculated shake correction amount, and instructs the shake correction drive unit 10 to perform shake correction according to the shake correction amount. Then, the blur correction driving unit 10 drives the blur correction lens 103 in a direction substantially orthogonal to the optical axis I. A method of detecting the shake of the camera body 1 and the lens barrel 2 and obtaining the spatial position and attitude fluctuation thereof is disclosed in Japanese Patent Application Laid-Open No. 7-225405 described in the related art, and therefore the description is omitted. I do. The method of obtaining the amount of blur caused by the camera body 1 and the lens barrel 2 being shaken is disclosed in Japanese Patent Application Laid-Open No. Sho 62-47012 or the like, and thus the description thereof is omitted.

At S150, CPU 4 determines whether full-press switch 11b is on or not. When it is determined that the full-press switch 11b is on, it means that the exposure operation has been instructed by the photographer.
The process proceeds to a series of exposure operations following “B”. Full-press switch 1
If it is determined that 1b has not been turned on, S160
And the photographing preparation operation such as the focusing drive is continued.

In S160, the CPU 4 instructs the focus detection unit 6 to detect a focus. The CPU 4 includes a focus detection unit 6
Is calculated based on the focus detection information output from the camera. If the focus detection unit 6 is a split pupil type focus detection device, it is easy to calculate how much the focus position is shifted even when the focus state is not currently in focus, which is convenient.

In step S170, the CPU 4 instructs the lens position detector 9 to detect a lens position. The lens position detection unit 9 outputs to the CPU 4 information on the current driving position of the focusing lens 102 in the optical axis I direction.
The CPU 4 calculates a photographing magnification from the photographing distance to the subject or the focal length f of the photographing optical system and the photographing distance based on the information regarding the driving position of the focusing lens 102. When the photographing optical system is a zoom lens,
It is preferable to provide a zoom position detection unit (not shown) capable of detecting the zoom position so that the photographing magnification can be accurately calculated.

In S180, the CPU 4 determines whether or not the camera is in focus. When the CPU 4 determines that focus is achieved, the process skips step S190 and proceeds to step S200. When the CPU 4 determines that focus is not achieved, the process proceeds to step S190.

In step S190, the CPU 4 instructs the lens focus drive unit 8 to drive the focusing lens 102 to focus. When the CPU 4 determines in S180 that the image is not in focus, the lens focus drive unit 8 needs to drive the focusing lens 102 to perform focus driving for focusing. Therefore, the CPU 4 calculates a driving amount necessary for focusing based on the shift amount of the focusing position calculated in S160 and the position information of the focusing lens 102 calculated in S170. The CPU 4 controls the driving of the lens focusing drive unit 8 based on the calculation result, and the lens focusing drive unit 8 moves the focusing lens 102 in the optical axis I direction by an appropriate amount. In S190, the CPU 4
Monitors the position information of the focusing lens 102 input from the lens position detection unit 9 in real time,
The driving accuracy of the focusing lens 102 can be improved.

In S200, the CPU 4 resets the Z displacement calculation value. By the steps up to S190,
By adjusting the position of the focusing lens 102 with respect to the spatial position and the attitude of the camera body 1 and the lens barrel 2, a currently focused state is obtained. But,
If the camera body 1 and the lens barrel 2 move in the direction of the optical axis I due to shaking such as vibration or vibration during an exposure operation to be described later, a focus position shift (focus shift) occurs. Then, the CPU 4 performs the displacement relating to the Z displacement stored in the CPU 4 such that the current position of the camera body 1 and the lens barrel 2 in the direction of the optical axis I is the position of “the amount of focus shift = 0”. The position information is reset (set) as “Z = 0”. The reset of the displacement position information “Z = 0”
This serves as a reference when updating the in-focus position based on the shake detection information of the shake detection unit 5 when there is movement due to shake in the direction of the optical axis I during an exposure operation described later.

The CPU 4 includes, for example,
A volatile storage element such as a DRAM stores information relating to the calculation of the position, attitude, and blur position of the camera body 1 and the lens barrel 2 with respect to the space. After finishing S200, the process returns to S130. In S130, the CPU 4 determines whether or not the shake correction start timer is OK.
In S150, it is determined again whether or not the full-press switch 11b is turned on. The CPU 4 has a full-press switch 11b.
The series of processing from S140 to S200 is repeated until is turned on.

In S150, the full-press switch 11b
Is on, the process proceeds to S210 in FIG. In S210, the CPU 4 instructs the focus detection unit 6 to stop focus detection. When the mirror-up drive is performed in S250 described later, the focus detection unit 6 cannot perform optical focus detection. So, C
The PU 4 instructs the focus detection unit 6 to stop optical focus detection based on the ON signal of the full-press switch 11b.

In S220, the CPU 4 determines whether or not the degree of blur is small. The CPU 4 executes S
120 and, for example, the CP
A predetermined storage value stored in a nonvolatile storage element such as an EEPROM in U4 is compared. When the CPU 4 determines that the detected blur information is not severer than the predetermined condition, that is, when it determines that the degree of blur is small, the photographing optical system is already in focus in S190, and this state is determined. There is no risk of collapse.
Therefore, since the focusing drive during the exposure operation described later is not necessary, the process skips S230 and S240 and proceeds to S250. When the CPU 4 determines that the detected blur information is more severe than the predetermined condition, that is, when it determines that the degree of blur is not small, the photographing optical system sets the camera body 1 and the lens barrel 2 in the optical axis I direction. The focus state is broken by the movement. Therefore, the focus driving during the exposure operation described later may be required, and the process proceeds to S230.

In S230, the CPU 4 determines whether or not the shooting distance is long. The CPU 4 executes S170
Is compared with a predetermined storage value stored in a nonvolatile storage element such as an EEPROM in the CPU 4. When the CPU 4 determines that the shooting distance is longer than a predetermined stored value, that is, when determining that the shooting distance is infinity or a considerable distance, the shooting optical system sets the focusing state in S190. There is no risk of collapse. Therefore, it is necessary to perform a focusing drive during the exposure operation, which will be described later, and the process skips S240 and proceeds to S250. When the CPU 4 determines that the shooting distance is shorter than a predetermined stored value, the focus state of the shooting optical system is broken due to the movement of the camera body 1 and the lens barrel 2 in the direction of the optical axis I. . Therefore, the focus driving during the exposure operation, which will be described later, is required, and the process proceeds to S240.

In step S240, the CPU 4 instructs the lens focus drive unit 8 to perform focus drive based on the blur detected value.
When proceeding to S240, the camera body 1 and the lens barrel 2 have moved in the direction of the optical axis I, and the in-focus state has been greatly distorted. Therefore, the CPU 4 calculates a displacement calculation value of the camera body 1 and the lens barrel 2 in the direction of the optical axis I based on the shake detection information from the shake detection unit 5, and calculates an appropriate focusing drive amount of the focusing lens 102. Ask. And CPU4
Controls the driving of the lens focusing drive unit 8, and the lens focusing drive unit 8 adjusts the position of the focusing lens 102 in the direction of the optical axis I so that the focused state can be always maintained.

In S250, the CPU 4 instructs the mirror driving section 7 to perform mirror up driving. The CPU 4 controls the driving of the mirror driving unit 7, and the mirror driving unit 7 performs a mirror-up operation to retract the mirror 71 from the photographing optical path during the photographing (exposure) operation.

In S260, the CPU 4 performs a shake correction reset. The CPU 4 instructs the blur correction drive unit 10 to control the drive of the blur correction lens 103 so that the optical axis of the blur correction lens 103 coincides with a substantially center position (hereinafter, referred to as a centering position) of the photographing optical system. CPU4
Calculates an appropriate shake correction amount based on the shake detection information from the shake detection unit 5. Then, the blur correction driving unit 10
Is in a direction substantially perpendicular to the optical axis I from the centering position,
Driving the blur correction lens 103 based on the blur correction amount,
Perform appropriate shake correction.

In S270, CPU 4 instructs exposure. The CPU 4 operates a shutter unit (not shown), and the shutter unit performs a photographing (exposure) operation. Even during this shooting operation, the CPU 4 continues to control the drive of the lens focus drive unit 8 for proper focus drive based on the shake detection information from the shake detection unit 5.

In S280, the CPU 4 instructs the blur correction drive unit 10 to stop blur correction. CPU4
After the appropriate photographing operation is completed, the shake correction driving unit 10
To stop the shake correction.

In S290, the CPU 4 instructs the mirror driving section 7 to perform mirror down driving. The CPU 4 controls the driving of the mirror driving unit 7, and the mirror driving unit 7 performs a mirror-down operation for driving the mirror 71 in the photographing optical path in preparation for another photographing operation. In S300,
A series of operations ends.

As described above, in the automatic focusing photographing apparatus according to the first embodiment of the present invention, in the photographing preparation state, rapid focusing driving is performed based on the detected imaging state of the photographing optical system. It can be carried out. Also, during the shooting operation, it is possible to calculate a change in the focusing state based on the swing detection information in the optical axis direction of the camera, and to perform the focusing drive of the shooting optical system during the shooting operation based on the calculation result. it can. Therefore, a clear image can be taken even in a close-up shooting condition in which the camera shake has a great effect. Further, the CPU 4 instructs the blur correction drive unit 10 to stop the blur correction drive in step 280 after the appropriate photographing operation is completed in step 280, so that the power consumption of the blur correction drive can be minimized. it can. Further, after the mirror driving unit 5 finishes the mirror down operation, by returning to step 130, it is possible to immediately shift to the photographing operation again.

(Second Embodiment) Next, an automatic focusing photographing apparatus according to a second embodiment of the present invention will be described. FIG. 5 is a schematic sectional view showing a single-lens reflex camera in which the automatic focusing photographing apparatus according to the second embodiment is used. FIG. 6 is a block diagram of an automatic focusing photographing apparatus according to the second embodiment. In addition,
In the following description, the same members as those of the first embodiment are denoted by the same reference numerals, and the detailed description of those portions will be omitted.

Camera body CPU according to the second embodiment
4B and the lens CPU 4L separate the CPU 4 of the first embodiment into a camera body 1 side and a lens barrel 2 side.
The camera body CPU 4 </ b> B mainly controls the sequence of the entire camera device based on a signal from the release switch 11 and the like, and performs central processing for performing arithmetic processing of focus detection information from the focus detection unit 6 and driving control of the mirror driving unit 7. Processing device. The camera body CPU 4B includes a focus detection unit 6
, The mirror driving unit 7 and the release switch 11 are connected.

The lens barrel CPU 4L processes various controls on the lens barrel 2 side, for example, processes information from the blur detecting section 5 and the lens position detecting section 9, and outputs a lens focus driving section 8, a blur correcting driving section It is a central processing unit that performs drive control such as. The lens barrel CPU 4L includes a blur detector 5,
The lens focus driving unit 8, the lens position detecting unit 9, and the blur correction driving unit 10 are connected. Camera body CPU
The lens barrel 4B and the lens barrel CPU 4L are electrically connected so that they can communicate with each other and transmit information. The camera body CPU 4B controls the operation contents and operation timing of the lens barrel CPU 4L.

In the second embodiment, in steps S100 and S150 to S160 in the flow described with reference to FIGS.
S180, S210, S250, S270 and S290
The subsequent steps are performed by the camera body CPU 4B.
For other steps, the lens barrel CPU 4L
Done in Necessary timing and information exchange between the respective steps are performed by electrical communication between the camera body CPU 4B and the lens barrel CPU 4L.

(Other Embodiments) The CPU 4 according to the embodiment of the present invention may be provided with a function of adjusting an imaging state as disclosed in, for example, Japanese Patent Application Laid-Open No. 3-256015. By adding such a function,
When the subject is moving, the imaging state of the photographing optical system can be adjusted based on the results of several past focus detections or the amount of movement of the subject predicted based on a predetermined movement trajectory function. When the subject is not moving, the imaging state of the photographing optical system can be adjusted by moving the camera body 1 and the lens barrel 2 in the direction of the optical axis I. In the embodiment of the present invention, a single-lens reflex camera is described as an example of the automatic focusing photographing apparatus. However, the present invention is also applicable to an automatic focusing apparatus such as a microscope.

Further, in the embodiment of the present invention, S200
, The focusing drive is performed based on the amount of displacement in the direction of the optical axis I. In the embodiment of the present invention, it is also possible to calculate the focusing drive speed based on the moving speed in the direction of the optical axis I in which the integration calculation is omitted, and to perform drive control based on this focusing drive speed. In this case, the focusing drive speed may be calculated based on the dimension of the acceleration. Further, information on camera shake in other dimensions, such as acceleration, speed, displacement, etc., can be used selectively or comprehensively. Note that the blur correction driving unit 10 may be omitted depending on the size of the automatic focusing photographing apparatus according to the embodiment of the present invention. In this case, S1
Steps S30, S140, S260 and S280 will be omitted.

In the above description, in S230, the CP
U4 compares the photographing distance with a predetermined stored value stored in the CPU 4, but may compare the photographing magnification with the photographing magnification when the photographing optical system is a zoom lens. Also, S2
In Steps S20 and S230, the CPU 4 determines whether or not the focusing drive based on the shake during the exposure operation is necessary.
Considering the focal length of the photographing optical system or the main use conditions of the automatic focusing photographing apparatus according to the embodiment of the present invention, one or both of them may be omitted. Further, the criteria for judging the necessity of the focusing drive in S220 and S230 can be freely changed according to the photographer's preference, for example, by dial operation, addition and replacement of a memory element, rewriting of stored information, and the like. Note that the order of S240 and S250 may be reversed.

[0055]

As described above in detail, according to the first aspect of the present invention, the focus drive control section drives the focus drive section based on the focus detection information, and then controls the shooting optical system. Since the focusing drive unit is driven and controlled based on the swing detection information in the optical axis direction, the imaging optical system after the focusing state swings irregularly in the optical axis direction. Changes,
Since the imaging optical system is driven based on the swing detection information in the optical axis direction, the imaging optical system can be brought into an image forming state.

According to the second aspect of the present invention, the focusing drive control section drives the focusing drive section based on the focus detection information in the shooting standby state, and then sets the shooting optical system in the shooting operation state. Based on the swing detection information in the optical axis direction of
Since the focus driving unit is drive-controlled, even if the shooting optical system swings irregularly in the optical axis direction during the shooting operation and the focus state changes,
The imaging optical system is driven based on swing detection information in the direction of the optical axis, so that an image is formed.

According to the third aspect of the present invention, the focusing drive control section sets information on drive control of the focusing drive section based on the swing detection information based on the focus detection information. According to the invention described in Item 4, the focusing drive control unit resets the information on the drive control of the focusing drive unit based on the swing detection information based on the focus detection information. When the camera moves in the optical axis direction during the photographing operation, the information on the drive control of the focusing drive unit based on the swing detection information is set (reset) based on the focus detection information serving as reference information.

According to the fifth aspect of the present invention, the focus drive section controls the drive of the focus drive section based on the swing detection information after the light guide section moving mechanism moves the light guide section. So do
Even during the photographing operation, appropriate drive control of the focusing drive unit can be performed based on the swing detection information.

According to the sixth aspect of the present invention, the focus drive control section determines whether or not to perform drive control of the focus drive section based on the swing detection information. The more the focus driving unit needs to be driven, the more it can be determined whether or not the focus state is affected.

According to the seventh aspect of the present invention, the focusing drive control unit performs the following based on the photographing distance and / or photographing magnification information.
Since it is determined whether or not to perform the drive control of the focusing drive unit, the degree of the swing is determined based on the photographing distance and / or the photographing magnification information. It can be determined whether the condition is affected.

According to the eighth aspect of the present invention, since the shake correction control unit controls the drive of the shake correction unit based on the swing detection information, it is possible to perform appropriate shake correction.

According to the ninth aspect of the present invention, the focus drive control section drives the focus drive section based on the focus detection information, and then, based on the swing detection information in the optical axis direction of the optical system. Since the focus driving unit is driven and controlled, the optical system after the focusing state swings irregularly in the direction of the optical axis. Since the driving is performed based on the swing detection information in the direction, the imaging optical system can be brought into an image forming state.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing a single-lens reflex camera using an automatic focusing photographing apparatus according to a first embodiment of the present invention.

FIG. 2 is a block diagram of the same device.

FIG. 3 is a flowchart illustrating an operation of the apparatus.

FIG. 4 is a flowchart following FIG. 3;

FIG. 5 is a schematic sectional view showing a single-lens reflex camera in which an automatic focusing photographing apparatus according to a second embodiment of the present invention is used.

FIG. 6 is a block diagram of the same device.

[Explanation of symbols]

 Reference Signs List 1 camera body 2 lens barrel 4 CPU 4B camera body CPU 4L lens barrel CPU 5 blur detection unit 6 focus detection unit 7 mirror drive unit 8 lens focusing drive unit 9 lens position detection unit 10 blur correction drive unit 11 release switch 11a Half-press switch 11b Full-press switch 101 First lens group 102 Second lens group (focusing lens) 103 Third lens group (blurring correction lens) I Optical axis of main optical system

Claims (9)

[Claims] An imaging optical system, a focus detection unit that detects an imaging state of the imaging optical system and outputs focus detection information, and detects a swinging state of the imaging optical system, A swing detection unit that outputs motion detection information, a focus drive unit that adjusts the imaging state of the imaging optical system, and after driving control of the focus drive unit based on the focus detection information, An autofocus photographing device, comprising: a focus drive control unit that drives and controls the focus drive unit based on the swing detection information in the optical axis direction of the photographing optical system. 2. The automatic focusing photographing apparatus according to claim 1, wherein the focusing drive control unit controls driving of the focusing driving unit based on the focusing detection information in a photographing preparation state, and performs photographing. In the operating state, drive control of the focusing drive unit based on the swing detection information is performed. 3. The automatic focusing photographing device according to claim 1, wherein the focusing drive control unit is configured to perform the focusing driving based on the swing detection information based on the focusing detection information. Setting information relating to drive control of the unit, wherein: 4. The automatic focusing photographing device according to claim 1, wherein the focusing drive control unit is configured to perform the focusing driving based on the swing detection information based on the focusing detection information. Resetting information related to drive control of the unit, wherein: 5. The method according to claim 1, wherein:
In the automatic focusing photographing apparatus according to the paragraph, a light guiding unit for guiding a light beam from the photographing optical system to the focus detecting unit, and the light guiding unit is associated with a photographing operation of the automatic focusing photographing device. A light guide moving mechanism for moving the light guide, wherein the focusing drive control unit performs the focusing based on the swing detection information after the light guide is moved by the light guide moving mechanism. An automatic focusing photographing device, which controls the driving of a driving unit. 6. Any one of claims 1 to 5
In the automatic focusing photographing device according to the paragraph, the focusing drive control unit, based on the swing detection information,
Determining whether or not it is necessary to control the driving of the focusing drive unit. 7. One of claims 1 to 6
The automatic focusing photographing device according to the item, further comprising: an optical system position detecting unit that detects photographing distance and / or photographing magnification information from a state of the photographing optical system, wherein the focusing drive control unit includes the photographing distance and And / or determining, based on the photographing magnification information, whether or not it is necessary to control the driving of the focusing drive unit. 8. One of claims 1 to 7
In the automatic focusing photographing apparatus according to the item, a part of the photographing optical system is driven in a direction substantially orthogonal to the optical axis to thereby correct a blur, and a drive of the blur correction part A shake correction control unit that performs control, wherein the shake correction control unit
Controlling the drive of the blur correction unit. 9. An optical system, a focus detection unit that detects an image formation state of the optical system and outputs focus detection information, and detects a swing state of the optical system to detect the swing state of the optical system. A focus detection unit that adjusts the imaging state of the optical system, and a drive control of the focus drive unit based on focus detection information from the focus detection unit. And a focusing drive control unit that drives and controls the focusing drive unit based on the swing detection information in the optical axis direction of the optical system.